Electrical relay



P. N. MARTIN ELECTRICAL RELAY Dec. 13, 1932.

Filed Jan. '7, 1932 INVENTOR Paul N. Mamz'zz. 622. M

7 /4 ATTORNEY.

Fig. 5.

patented Dec.

.rA Ln; MARTIIL'OE SWISSVALE, rnnnsYLvANIA, ASSIGNOR TO THE UNION SWITCH and particularly to relays of the SYLYANIA ;&;'fS'IGNAL.-C0MP A1 \TY, or swrssvALn, rnnnsynvanm, A CORPORATION or PENN- nLncrnrcALnnnAY I Applica t ion fi led J'anuary 7, 1932. Serial Nol 58 5,326.

Myl invention relates to electrical relays,

direct current polarized type comprisinga neutral armature responsive "I will describe three forms of relays em- ,operating current.

armature responsive to thepresence and absence off operating current,and a polarized to the polarity of the Relays of this :type as ordinarily constructeda-se ch'aracterized'bythe. fact that the neutral armature opens momentarily when the polarity my invention is the provision of noveland improved means for preventing the neutral armature from opening due to the reversal ofthe polarity of the current supplied to the operating winding.

body-mg my invention, and willthen point out the' novel features thereoffi'n claims.

In the accompanying. drawing,Fig. 1 is a view, partly in side elevation and partly diagrammatiqshowing one form o frelay emi l bodying my invention. Fig.2 isa view simil'25 lar to Fig. l, buytfshowing a modified form of relay embodying my invention. Fi 3 i 1 1s abottom plan vlew showing amodli ic'ation of a portion of the relay shown in F1 .2 and also embodymg'my nvention;

imilarreference characters refer to sunllar parts in each of theseveralviews.

Referring first to Fig. 1, the relay in the form here shown comprises a U-shaped core 35. ing 6.

5 provided with the usualmain pole pieces E and F and Co-acting with the pole,pieces E and F p is a main armature member B, this memberpbeing biased by gravity to drop away from the pole pieces, whereby it is attracted' to the @is energized. i

The, relay also comprises twoauxiliary" core members 7 and 7? attached to t hGftWO pole piecesE and F respectively, andtermi natingin auxiliary pole pieces Cand .D,

which coact with another armature mem-p her A. lVIembers A and B are rigidly coni Y The auxiliary; core members Tand 7 areflprovided bands or ferrules 8, 8 respectively, of electro-fl nectedtogether by rods 12.

of the current supplied to the operating winding is reversed One feature of the usual operating wind:

essential to pole pieces when the winding 6 conductive material, which bands serve to oppose and thereby delay any change of flux ergized, armature memberBis attracted to pole pie'ces'E and F,while armature member A isattractedtopole pieces G and D. When 7 and 7 and the the polarity of the currentsupplied' to the Winding 6 is reversed, the flux through armature member B will momentarily pass through armature member A Will still have an appreciable value, due to the bands or ferrules 8, 8 and so this armature member will hold the armature assembly in its attracted position until the flux in member B builds up to the value required to hold the armature assemblyl WVhen winding 6 becomes deenergized for an appreciable length of time, however, the flux flowing through both armaturemembers will drop to zero and the armatureas a whole will then be released.

It is understood that the relay will also be provided with a polarized armature responsive to the polarity of the current 'supp'li ed tothe operating Winding 6, but this armature is omitted from the drawing because it is not ventionifi Referring now to Fig. 2, the relay shown 111 this view comprises a U shaped core member 5 provided with pole pieces J and K and carrying the usual operating winding 6. The

a1clearunderstanding of my inthrough zero, but at such time the flux relayalso comprises two auxiliary pole pieces 7 L and M connected by anauxiliary U-shaped core made up oftwolegs 10, 10 and a back stra'p 9. The; armature, which is here designatedF, co-acts with all four pole pieces L,

Jand M, and is provided with a portion ofreduced cross-sectional area between the poles J and K. The legs 10 and 10? are provided with bands or ferrules 8, 8 respectively, for the purpose of delaying change of flux in the auxiliary magnetic path. I

When the winding 6 is energized, partof the flux due to the current in this winding flows from pole piece J to pole piece K or'vice versa through the armature F. The remain der of the flux flows in a path which passes from pole piece J through the left-hand portion of armature F,,pole piece L, leg 10, back strap 9, leg 10 pole piece M and the righthand portion of armature F to pole piece K.

the Change of flux through each of said aux iliary core members, and an auxiliary armature member mechanically attached to said main armature member and coacting with said auxiliary pole pieces, said main armature member having a portion oi restricted section between said two main pole pieces to force flux through said auxiliary core meni-- bers and said auxiliary armature member.

In testimony whereof I aflix my signature.

PAUL N. MARTIN.

WVhen the winding 6 becomes deenergized,

the portion of the magnetic flux which flows directly through the armature between pole pieces J and K will pass through zero, but at this time the flux flowing through the auxiliary magnetic path will have an appreciable value', and will serve to keepthe armature F in its attracted position until the flux in the main magnetic circuit builds up to an appreciable value. The backstrap 9 in Fig. 2 will, of course, be offset to pass around the winding 6 on the main core 5. 7

If desired, the pole pieces of the relay shown in Fig. 2 may be arranged in the man;

ner shown in Fig; 3,1n which case the armature, which is here designated F will be U:

shaped as shown in the drawing, the restricted portion 11 being disposed in that part of the armature which bridges pole pieces J and K. H p

The polarized, armature is omitted from Figs. 2 and 3, for the reasons stated above in discussing Fig. 1.

Although I have herein shown and described only a few forms of relays'embodying my invention, it is understood that various changes and modifications may be made therein within the scope of the appended claims without departing from the spirit and scope of my invention.

Having thus described my invention, what I claim is: V

1. A relay comprising a core provided with the usual main pole pieces and operating winding, a main armature member co-acting in the usual way with said main pole pieces, two auxiliary core'members attached to said two pole pieces respectively and terminating in auxiliary polepieces, means for delaying the change of flux through each of said auxiliary core members, and an auxiliary armaturemember mechanically attached to said main armature member and co-acting with said auxiliary pole pieces; 7

2. A relay comprising a core provided with the usual main pole pieces and operating winding, a main armature member c'o-acting in the usual way with said main pol-e pieces, two, auxiliary core members attached to said two pole piecesrespectively and terminating in auxiliary pole pieces, means for delaying 

